如何檢查兩個圖像視圖是否位於同一位置？

Question

我正在一個項目中，圖像可拖拽。其中如果我把一個圖像放在另一個圖像上，圖像必須改變。我想要的是 1）我想檢查兩張圖片是否在同一個地方。 2）圖像的位置不能是exact.It可以近似等於

Answer 1

這裏有一個方法假設圖像的大小相同

// using ints because it is easier for taking the abs value 
int dx,dy; 

dx = frame1.origin.x - frame2.origin.x; 
dy = frame1.origin.y - frame2.origin.y; 
dx = abs(dx); 
dy = abs(dy); 

// overlapping width and height 
int ovHeight, ovWidth; 

ovWidth = frame1.size.width-dx; 
ovHeight = frame1.size.height-dy; 

int ovArea = ovWidth*ovHeight; 
int imageArea = frame1.width*frame1.height; 

int percentOverlap = ovArea*100/imageArea; 

if (percentOverlap > 80) { 
    // do work here 
} 

Answer 2

CGRect frame1 = imgView1.frame; 
CGRect frame2 = imgView2.frame; 

這會給你兩個框架structures..which由原點（x的，y）的值和尺寸（寬度，身高） values ..

根據您的需要進行比較。

Answer 3

//for checking whether one image is inside another image 
if(CGRectContainsRect(ImageView1.frame, ImageView2.frame)) 
{ 
    //your code for overlapping here 
} 

//for checking whether one image intersects another 
if(CGRectIntersectsRect(ImageView1.frame,ImageView2.frame)) 
{ 
    //your code for intersection here   
} 

Answer 4

如果要檢查兩個UIImages相交，這是一個好辦法：

CGRect rect1 = myView1.frame; 
CGrect rect2 = myView2.frame; 

if (CGRectIsNull(CGRectIntersection(rect1, rect2))) { 
    //They collide 
} 

你有關於此的所有信息：

https://developer.apple.com/library/mac/#documentation/graphicsimaging/reference/CGGeometry/Reference/reference.html